A vessel intends to travel at a course due South. The movement of the sea current is from SE. At what course must the vessel stir?
E
NE
SE
NW
SW
The vessel must stir towards the NE direction.
To determine the course the vessel must stir, we need to consider the combined effect of the desired Southward course and the current from the Southeast.
The vessel wants to go directly South, but the current is pushing towards the Southeast. This means the vessel needs to adjust its course to counteract the effect of the current.
To do this, we can use vector addition. Imagine drawing two vectors: one pointing South for the desired course and one pointing Southeast for the current. The result of adding these two vectors will give us the direction the vessel needs to steer.
When we draw these vectors, we see that the desired Southward course is directly opposite to the current from the Southeast. Therefore, the vessel needs to steer toward the opposite direction of the Southeast, which is Northwest (NW).
So, the answer is NW. The vessel must stir towards the Northwest to counteract the effect of the Southeast current and travel in a due South direction.
To calculate the course the vessel must steer, we need to find the resultant vector of the vessel's intended course due South and the movement of the sea current from SE.
1. Draw a diagram with a vector representing the vessel's intended course due South (straight down) and another vector representing the sea current movement from SE (45 degrees to the right and downward).
2. Add the two vectors together by placing the head of the sea current vector (SE) at the tail of the vessel's intended course vector (S).
3. Draw the resultant vector (the sum of the two vectors) from the tail of the vessel's intended course vector (S) to the head of the sea current vector (SE).
4. Measure the angle between the vessel's intended course vector (S) and the resultant vector.
5. The course the vessel must steer is the direction of the resultant vector.
Based on the diagram and calculations, the vessel must steer in the NE (Northeast) direction.